Draw boxplot with notch in R

Question

Hi Team,

I have created a boxplot in R. I want to draw a boxplot with the notch to find out how the medians of different data groups match with each other. How can I do that?

Answer 1

Hi@akhtar,

We can draw a boxplot with a notch to find out how the medians of different data groups. The below script will create a boxplot graph with the notch for each of the data groups.

png(file = "boxplot_with_notch.png"
boxplot(mpg ~ cyl, data = mtcars, 
   xlab = "Number of Cylinders",
   ylab = "Miles Per Gallon", 
   main = "Mileage Data",
   notch = TRUE, 
   varwidth = TRUE, 
   col = c("green","yellow","purple"),
   names = c("High","Medium","Low")